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| Circulus | |
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| Shell of Circulus ryalli (paratype at MNHN, Paris) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Truncatelloidea |
| Family: | Vitrinellidae |
| Genus: | Circulus Jeffreys, 1865 |
| Type species | |
| Delphinula duminyi Requien, 1848
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| Synonyms[1] | |
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Circulus is a genus of very small and minute sea snails with an operculum, marine gastropod mollusks in the family Vitrinellidae.[2]
- ^ OBIS : Circulus
- ^ MolluscaBase eds. (2020). MolluscaBase. Circulus Jeffreys, 1865. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=137626 on 15 August 2020